Title

The IBM z/VM DOMAINSEARCH statement in the TCP/IP DATA file must be configured with proper domain names for name resolution. (Cat II impact)

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data origin authentication verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. This is not applicable if DNSSEC is not implemented on the local network.

Check Content

Examine the TCP/IP configuration File. If there is no “DOMAINSEARCH” statement, this is a finding. If the “DOMAINSEARCH” statement does not specify a proper domain, this is a finding.

Fix Text

Configure a “DOMAINSEARCH” statement in the TCP/IP configuration file with a proper domain name.

Additional Identifiers

Rule ID:

Vulnerability ID: IBMZ-VM-001150

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.